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| The Loop Antenna Calibration System using the Three-Antenna Method and the Uncertainty Estimation for the Measurement Results |
| QIN Yao1,WU Yan-li2,LIU Xiao3 |
1. College of Information Science and Technology,Key Laboratory of Grain Information Processing and Control, Henan University of Technology, Zhengzhou, Henan 450001, China
2. Henan Institute of Metrology, Zhengzhou, Henan 450008, China
3. National Institute of Metrology, Beijing, 100029, China |
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Abstract In the 350kHz~30MHz frequency band, in order to accurately obtain the field strength where the loop antenna is located, the antenna factor of the loop antenna needs to be calibrated. The three-antenna method is an absolute method for calibrating the antenna factor.Antenna calibration using the three-antenna method requires three antennas to form three antenna pairs and does not require any reference standard.TAM is discussed in detail, a calibration system based on a vector network analyzer is set up, and the standard uncertainty of the calibration system is evaluated.It is not possible to derive the uncertainty introduced by the calculation formula based on K(i,j). Therefore, the numerical electromagnetics code (NEC) simulations are used to evaluate the uncertainty of K(i,j). The evaluation results show that the extended uncertainty of the four typical frequency points in the 350kHz~30MHz frequency band is less than 0.81dB (k=2).
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Received: 20 April 2020
Published: 18 October 2021
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2021, Vol. 42 
